// 定义全局变量
var CalendarData = new Array(100)
var madd = new Array(12)
var tgString = '甲乙丙丁戊己庚辛壬癸'
var dzString = '子丑寅卯辰巳午未申酉戌亥'
var numString = '一二三四五六七八九十'
var monString = '正二三四五六七八九十冬腊'
var weekString = '日一二三四五六'
var sx = '鼠牛虎兔龙蛇马羊猴鸡狗猪'
var cYear, cMonth, cDay, TheDate
CalendarData = new Array(0xA4B, 0x5164B, 0x6A5, 0x6D4, 0x415B5, 0x2B6, 0x957, 0x2092F, 0x497, 0x60C96, 0xD4A, 0xEA5, 0x50DA9, 0x5AD, 0x2B6, 0x3126E, 0x92E, 0x7192D, 0xC95, 0xD4A, 0x61B4A, 0xB55, 0x56A, 0x4155B, 0x25D, 0x92D, 0x2192B, 0xA95, 0x71695, 0x6CA, 0xB55, 0x50AB5, 0x4DA, 0xA5B, 0x30A57, 0x52B, 0x8152A, 0xE95, 0x6AA, 0x615AA, 0xAB5, 0x4B6, 0x414AE, 0xA57, 0x526, 0x31D26, 0xD95, 0x70B55, 0x56A, 0x96D, 0x5095D, 0x4AD, 0xA4D, 0x41A4D, 0xD25, 0x81AA5, 0xB54, 0xB6A, 0x612DA, 0x95B, 0x49B, 0x41497, 0xA4B, 0xA164B, 0x6A5, 0x6D4, 0x615B4, 0xAB6, 0x957, 0x5092F, 0x497, 0x64B, 0x30D4A, 0xEA5, 0x80D65, 0x5AC, 0xAB6, 0x5126D, 0x92E, 0xC96, 0x41A95, 0xD4A, 0xDA5, 0x20B55, 0x56A, 0x7155B, 0x25D, 0x92D, 0x5192B, 0xA95, 0xB4A, 0x416AA, 0xAD5, 0x90AB5, 0x4BA, 0xA5B, 0x60A57, 0x52B, 0xA93, 0x40E95)
madd[0] = 0
madd[1] = 31
madd[2] = 59
madd[3] = 90
madd[4] = 120
madd[5] = 151
madd[6] = 181
madd[7] = 212
madd[8] = 243
madd[9] = 273
madd[10] = 304
madd[11] = 334

function GetBit(m, n) {
  return (m >> n) & 1
}
// 农历转换
function e2c() {
  TheDate = (arguments.length != 3) ? new Date() : new Date(arguments[0], arguments[1], arguments[2])
  var total, m, n, k
  var isEnd = false
  var tmp = TheDate.getYear()
  if (tmp < 1900) {
    tmp += 1900
  }
  total = (tmp - 1921) * 365 + Math.floor((tmp - 1921) / 4) + madd[TheDate.getMonth()] + TheDate.getDate() - 38

  if (TheDate.getYear() % 4 == 0 && TheDate.getMonth() > 1) {
    total++
  }
  for (m = 0; ;m++) {
    k = (CalendarData[m] < 0xfff) ? 11 : 12
    for (n = k; n >= 0; n--) {
      if (total <= 29 + GetBit(CalendarData[m], n)) {
        isEnd = true; break
      }
      total = total - 29 - GetBit(CalendarData[m], n)
    }
    if (isEnd) break
  }
  cYear = 1921 + m
  cMonth = k - n + 1
  cDay = total
  if (k == 12) {
    if (cMonth == Math.floor(CalendarData[m] / 0x10000) + 1) {
      cMonth = 1 - cMonth
    }
    if (cMonth > Math.floor(CalendarData[m] / 0x10000) + 1) {
      cMonth--
    }
  }
}

function GetcDateString() {
  var tmp = ''
  /* 显示农历年：（ 如：甲午(马)年 ）*/
  /* tmp+=tgString.charAt((cYear-4)%10);
  tmp+=dzString.charAt((cYear-4)%12);
  tmp+="(";
  tmp+=sx.charAt((cYear-4)%12);
  tmp+=")年 ";*/
  if (cMonth < 1) {
    tmp += '(闰)'
    tmp += monString.charAt(-cMonth - 1)
  } else {
    tmp += monString.charAt(cMonth - 1)
  }
  tmp += '月'
  tmp += (cDay < 11) ? '初' : ((cDay < 20) ? '十' : ((cDay < 30) ? '廿' : '三十'))
  if (cDay % 10 != 0 || cDay == 10) {
    tmp += numString.charAt((cDay - 1) % 10)
  }
  return tmp
}

function GetLunarDay(solarYear, solarMonth, solarDay) {
// solarYear = solarYear<1900?(1900+solarYear):solarYear;
  if (solarYear < 1921 || solarYear > 2020) {
    return ''
  } else {
    solarMonth = (parseInt(solarMonth) > 0) ? (solarMonth - 1) : 11
    e2c(solarYear, solarMonth, solarDay)
    return GetcDateString()
  }
}

/* 获取当前农历*/
export default function showCal() {
  var D = new Date()
  var yy = D.getFullYear()
  var mm = D.getMonth() + 1
  var dd = D.getDate()
  var ww = D.getDay()
  var ss = parseInt(D.getTime() / 1000)
  if (yy < 100) yy = '19' + yy
  return GetLunarDay(yy, mm, dd)
}

